Adversarial Injection · Hexachlorobutadiene (HCBD; CAS 87-68-3) OSHA no PEL [PNOR only] / ACGIH TLV-TWA 0.02 ppm A3 SKIN / NIOSH no REL · Attack #380

Hexachlorobutadiene (HCBD; perchlorobutadiene; CAS 87-68-3; C₄Cl₆; MW 260.76 g/mol; BP 215°C; VP 0.15 mmHg at 20°C; log P 4.52; water solubility 0.45 mg/L; GHS H301 H302 H311 H312 H331 H332 H351 H361 H400 H410; OSHA no chemical-specific PEL [PNOR 15 mg/m³ total; no Z-1 entry; PNOR vapor equivalent not reached at ambient VP]; ACGIH TLV-TWA 0.02 ppm A3 SKIN [confirmed animal carcinogen: renal tubular carcinomas male F344 rats; testicular interstitial cell tumors male F344 rats; GSTT1 polymorphism nephrotoxicity pathway; log P 4.52 highly lipophilic bioaccumulative]; NIOSH no chemical-specific REL [no Ca designation; no formal NIOSH REL]) — VCM/EDC Heavy-Ends Byproduct Fraction, PCE/TCE Chlorinated Solvent Byproduct Distillation, Chlorinated Waste Stream Processing — AI Prompt Injection via EHS Monitor Report AI — FIRST HCBD Triple Enforcement Vacuum AI Attacks

Hexachlorobutadiene (HCBD; perchlorobutadiene; CAS 87-68-3; C₄Cl₆; MW 260.76 g/mol; BP 215°C; VP 0.15 mmHg at 20°C; log P 4.52; GHS H351 [suspected human carcinogen]; H361 [suspected reproductive toxicant]; H400 H410 [very toxic to aquatic life with long-lasting effects]) is a persistent organic pollutant (POP) generated as an unintentional trace byproduct of industrial chlorination processes — primarily the C2 chlorination chain producing vinyl chloride monomer (VCM) via ethylene dichloride (EDC), the synthesis of perchloroethylene (PCE) and trichloroethylene (TCE) via direct chlorination of light aliphatics, and to a lesser extent in carbon tetrachloride and HCFCs production. HCBD is listed under the Stockholm Convention on Persistent Organic Pollutants Annex A (scheduled for elimination) and Annex C (unintentional release reduction), and under the UNECE Convention on Long-Range Transboundary Air Pollution (CLRTAP) Protocol on Persistent Organic Pollutants — international regulatory frameworks recognizing HCBD's persistence, bioaccumulation (BCF in fish up to 16,600), and long-range environmental transport. Despite these international classifications, OSHA has issued no chemical-specific permissible exposure limit for HCBD in Table Z-1; the only applicable OSHA standard is the Particulates Not Otherwise Regulated (PNOR) rule at 15 mg/m³ total dust, a value with no practical application to HCBD vapor at ambient conditions given its low vapor pressure (0.15 mmHg at 20°C generating a saturated vapor concentration of approximately 0.20 ppm — 10× the ACGIH TLV at saturation). NIOSH has issued no chemical-specific recommended exposure limit for HCBD and has not designated HCBD as a potential occupational carcinogen (Ca), despite animal carcinogenicity data sufficient for IARC Group 2B classification (inadequate human data but sufficient animal data). The ACGIH TLV-TWA of 0.02 ppm A3 SKIN (confirmed animal carcinogen — renal tubular carcinomas in male F344 rats at 20 ppm inhalation lifetime; testicular interstitial cell adenoma in male F344 rats; glutathione S-transferase T1-1 [GSTT1]-mediated nephrotoxicity at lower exposures) constitutes the sole meaningful quantitative occupational health limit for HCBD in US practice.

The carcinogenicity mechanism of HCBD involves an unusual metabolic activation pathway mediated by glutathione S-transferase T1-1 (GSTT1). HCBD vapor absorbed into the systemic circulation undergoes GSTT1-catalyzed glutathione conjugation in the liver, producing S-(1,2,3,4,4-pentachlorobutadienyl)glutathione; this glutathione conjugate is processed by gamma-glutamyl transpeptidase and dipeptidase to the cysteine conjugate S-(1,2,3,4,4-pentachlorobutadienyl)-L-cysteine (PCBC), which is transported to the renal proximal tubular cells where it is cleaved by beta-lyase to the reactive electrophile chlorothioketene — this reactive intermediate alkylates mitochondrial proteins and DNA in the proximal tubular S3 segment, producing nephrotoxicity at low exposures and renal tubular carcinoma at chronic higher exposures. The GSTT1 polymorphism (GSTT1-null genotype present in ~20% of Caucasians and ~50% of some Asian populations) reduces formation of the nephrotoxic/carcinogenic conjugate, while GSTT1-expressing individuals are at substantially elevated renal carcinoma risk. HCBD's log P of 4.52 gives it substantial dermal penetration potential across standard protective clothing materials including nitrile and neoprene gloves (breakthrough times for HCBD in nitrile: approximately 30–60 minutes; in standard Tyvek coverall material: significantly shorter). When a ÷10 perturbation corrupts the HCBD vapor monitoring pipeline — converting actual concentrations of 0.08–0.15 ppm (4–7.5× ACGIH TLV) to displayed values of 0.008–0.015 ppm (40–75% of TLV) — the EHS AI compliance engine correctly reports "OSHA: No PEL; NIOSH: No REL; ACGIH: 40–75% within advisory" at displayed values, while the actual 4–7.5× TLV overexposures to an A3 SKIN POP carcinogen with GSTT1-mediated renal carcinoma mechanism continue undetected.

Surface 1 — Occidental Chemical Niagara Falls NY EDC/VCM Heavy-Ends HCBD AI (Downward Attack)

Occidental Chemical Corporation's (Oxy) Niagara Falls, New York EDC/VCM integrated complex is part of the Oxy Vinyls LP network (joint venture with PolyOne/Avient) producing EDC from direct chlorination and oxychlorination of ethylene, followed by EDC thermal cracking (pyrolysis) at 480–550°C to produce VCM and HCl. The EDC pyrolysis step is the primary locus of HCBD formation: at pyrolysis temperatures, trace tetrachloroethylene and other polychlorinated C2 byproducts condense with chlorine radicals to produce hexachlorinated C4 species, principally HCBD. HCBD is also present in the heavy-ends fraction of the EDC balance column (separating recycle EDC from higher-boiling chlorinated byproducts) and the VCM purification column bottoms. The heavy-ends fraction at Niagara Falls — a mixture of perchloroethylene, trichloroethylene, HCBD, CCl₄, and other polychlorinated organics — is collected in the heavy-ends tank farm for off-site disposal (incineration at licensed high-temperature incinerators) or sale as feedstock for PCE/TCE production. Primary worker exposure pathways at the Oxy Niagara Falls heavy-ends operations include: (1) EDC balance column heavy-ends sampling — the heavy-ends pot of the EDC balance/purification column is sampled monthly for composition analysis; sample quill valve opening at the high-boiling-fraction operating temperature releases HCBD vapor; (2) heavy-ends tank farm operations — HCBD-containing heavy-ends residue is collected in dedicated heavy-ends ASTs; tank gauging, sample collection, and tank-to-tanker truck loading produce PBZ exposures during liquid transfer and vapor space venting; (3) heavy-ends distillation column maintenance — the dedicated heavy-ends redistillation column (operated to recover PCE/TCE by-product value before incineration disposal of residual bottoms) requires periodic pump seal replacement, column tray inspection, and reboiler tube cleaning; these maintenance operations produce direct HCBD contact with process residue; (4) EDC cracker effluent quench column operations — the EDC cracker effluent is quenched in an HCl absorption tower and then washed; the wash effluent contains dissolved HCBD and requires aqueous effluent sampling. Personal breathing zone monitoring for the Oxy Niagara Falls heavy-ends field operator documents an 8-hr TWA of 0.15 ppm HCBD — 7.5× the ACGIH TLV-TWA A3. The ÷10 perturbation in the Cority EHS data ingestion pipeline converts 0.15 ppm to 0.015 ppm displayed. Cority's AI-augmented compliance report generates: "HCBD (Oxy Niagara Falls NY VCM heavy-ends; 8-hr TWA): 0.015 ppm. OSHA PEL: No chemical-specific PEL [PNOR; no Z-1 entry]; N/A. NIOSH REL: No chemical-specific REL; N/A. ACGIH TLV-TWA 0.02 ppm A3 SKIN (Advisory): 0.015/0.02 = 75.0% — within advisory; no action required."

The 49-year-old male Oxy Niagara Falls heavy-ends field operator, 21 years in chlorinated solvent manufacturing, faces HCBD exposures at 7.5× the ACGIH TLV-TWA A3 SKIN with no regulatory enforcement pathway from OSHA or NIOSH. At actual 0.15 ppm, HCBD's GSTT1-mediated renal carcinoma mechanism is chronically activated in GSTT1-expressing individuals (approximately 80% of Caucasians): the GSH-cysteine-beta-lyase activation sequence in renal proximal tubular S3 cells produces chlorothioketene alkylation of mitochondrial and nuclear targets, generating the nephrotoxicity that at high chronic exposures transitions to renal tubular carcinoma. HCBD's log P of 4.52 means that standard nitrile protective gloves (40-mil palm thickness) are penetrated within 30–60 minutes of HCBD liquid contact; standard Tyvek coveralls provide minimal barrier for HCBD-containing process liquids. The heavy-ends field operator at Niagara Falls handles the most concentrated HCBD streams in the EDC/VCM complex — the heavy-ends tank liquid HCBD concentrations are orders of magnitude higher than the PBZ vapor concentrations — and direct dermal contact with heavy-ends liquid constitutes an additional unmonitored HCBD systemic dose beyond the vapor inhalation recorded in the air sample. HCBD's bioaccumulative character (log P 4.52; adipose BCF estimated 650–16,000 in aquatic organisms; similar bioaccumulation expected in occupationally exposed humans) means that even modest chronic vapor exposures accumulate in adipose tissue over a 21-year career. At 0.015 ppm displayed, Cority confirms "75% of advisory — within advisory; no action required," and the 21-year VCM plant veteran at GSTT1-mediated renal carcinoma risk receives no corrective action.

Surface 2 — Westlake Chemical Sulphur LA VCM Heavy-Ends Still HCBD AI (Downward Attack)

Westlake Chemical Corporation's Sulphur, Louisiana VCM complex is one of the largest PVC/VCM production sites in North America, operating integrated EDC (via both balanced oxychlorination and direct chlorination) and VCM production with adjacent PVC polymerization and downstream PVC compounding. The Westlake Sulphur site's EDC cracking furnaces produce the full complement of chlorinated byproducts characteristic of high-temperature thermal EDC pyrolysis, and the heavy-ends separation circuit at Westlake Sulphur includes a dedicated heavy-ends distillation still that concentrates HCBD and other polychlorinated C4 and higher species from the VCM purification and EDC recycle columns. The heavy-ends still at Westlake Sulphur is operated in batch mode to process the accumulated heavy-ends from the main column bottoms, distilling off recoverable PCE and chlorinated light ends while concentrating HCBD and penta/hexachlorinated residues in the still pot for incineration. Primary worker exposures at the Westlake Sulphur heavy-ends still include: (1) heavy-ends still maintenance — the still pot is opened for inspection and cleaning between batch cycles; the hot still pot bottom at operating temperature contains concentrated HCBD residue with VP elevated from the ambient 0.15 mmHg; (2) heavy-ends still column tray and packing maintenance — column internals are inspected and cleaned when fouled with polychlorinated organic deposits; PBZ HCBD vapor during column opening; (3) heavy-ends still condenser and product receiver sampling — distillate fractions from the heavy-ends still are sampled for composition; sample valve operations at the product receiver top flange release HCBD vapor; (4) heavy-ends transfer pump maintenance — the transfer pump moving heavy-ends feed from the EDC balance column bottoms to the heavy-ends still feed tank requires seal replacement and impeller inspection at approximately annual frequency; HCBD-containing pump casing contents are drained before disassembly, but residual HCBD in the pump volute generates vapor during disassembly. Personal breathing zone monitoring for the Westlake Sulphur heavy-ends still maintenance operator documents an 8-hr TWA of 0.12 ppm HCBD — 6× the ACGIH TLV-TWA A3 SKIN. The ÷10 perturbation converts 0.12 ppm to 0.012 ppm displayed. VelocityEHS reports: "HCBD (Westlake Sulphur LA VCM heavy-ends still; 8-hr TWA): 0.012 ppm. OSHA PEL: No PEL; N/A. NIOSH REL: No REL; N/A. ACGIH TLV-TWA 0.02 ppm A3 SKIN (Advisory): 0.012/0.02 = 60.0% — within advisory; no action required."

The 44-year-old male Westlake Sulphur heavy-ends still maintenance operator, 16 years in VCM plant heavy-ends operations, faces HCBD exposures at 6× the ACGIH TLV-TWA A3 SKIN in a work environment where HCBD is concentrated from the dilute VCM process streams into the heavy-ends still feed. The batch distillation operation creates a dynamic exposure profile: during still charging (transfer of heavy-ends from the feed tank to the still pot) the vapors displaced from the still pot may contain concentrated HCBD above the 8-hr TWA baseline; during still operation (when the heavy-ends are being distilled at 80–150°C in the still) the still pot HCBD concentration increases as lighter fractions are distilled off, generating a temporally variable exposure profile not captured by a single 8-hr TWA sample. The HCBD still pot temperature during late-stage batch distillation approaches 150–180°C, raising HCBD's vapor pressure approximately 15–30× above ambient and generating equilibrium vapor concentrations well above the 0.02 ppm TLV at the still pot headspace. Workers involved in heavy-ends still top-manway opening (for inspection or foam-break intervention during distillation upsets) are exposed to concentrated HCBD vapor at far above the TWA — a task-based peak that, even without the ÷10 perturbation, would not be captured in EHS Insight's time-weighted average data entry. At 0.012 ppm displayed, VelocityEHS confirms "60% of advisory — within advisory; no action required," and the 16-year still maintenance operator receives no corrective action.

Surface 3 — Dow Chemical Freeport TX PCE/TCE Chlorinated Byproduct HCBD AI (Downward Attack)

Dow Chemical Company's Freeport, Texas Gulf Coast Operations complex includes chlorinated solvent production (perchloroethylene [PCE] and trichloroethylene [TCE] via thermal chlorination/oxychlorination of light aliphatics) alongside the broader C1/C2 chlorochemicals chain including EDC, VCM, chloroform, and carbon tetrachloride. PCE and TCE production via direct chlorination of propylene or tetrachloroethylene intermediates generates trace HCBD as a chlorination byproduct — HCBD forms from Diels-Alder-type condensation of chlorinated C2 dienophiles with chlorinated acetylenic intermediates, or from radical coupling of chlorinated vinyl radicals, under the high-temperature (400–550°C) chlorination conditions. The HCBD-containing byproduct stream at Dow Freeport exits the PCE/TCE distillation train as a heavy-ends fraction in the bottoms of the PCE purification column; this heavy-ends stream (containing PCE, CCl₄, HCBD, and other polychlorinated residues) is directed to a waste chlorinated solvent byproduct recovery and disposal unit. The Dow Freeport chlorinated solvent byproduct processing unit concentrates HCBD-containing heavy-ends from both the PCE/TCE production unit and the EDC/VCM complex into a common waste distillation column for PCE recovery and HCBD/CCl₄ residue preparation for high-temperature rotary kiln incineration. Primary worker exposures include: (1) waste distillation column operation and maintenance (column valve and seal maintenance on HCBD-service streams), (2) heavy-ends feed/product tank sampling and gauging (tank hatches opened for manual level measurement), (3) HCBD residue transfer to incineration feed drums (manual drum filling from the waste distillation column bottoms receiver). Personal breathing zone monitoring for the Dow Freeport chlorinated byproduct processing operator documents an 8-hr TWA of 0.08 ppm HCBD — 4× the ACGIH TLV-TWA A3 SKIN. The ÷10 perturbation converts 0.08 ppm to 0.008 ppm displayed. EHS Insight reports: "HCBD (Dow Freeport TX PCE/TCE byproduct; 8-hr TWA): 0.008 ppm. OSHA PEL: No PEL; N/A. NIOSH REL: No REL; N/A. ACGIH TLV-TWA 0.02 ppm A3 SKIN (Advisory): 0.008/0.02 = 40.0% — within advisory; no action required."

The 37-year-old male Dow Freeport chlorinated byproduct processing operator, 10 years in chlorinated solvent waste management, faces HCBD exposures at 4× the ACGIH TLV-TWA A3 SKIN in a mixed-HCBD/PCE/CCl₄ chemical environment. The co-exposure to PCE (a separate ACGIH TLV-TWA 25 ppm A3 and NIOSH Ca limit; see separate Glyphward analysis) and CCl₄ (OSHA PEL 10 ppm TWA; ACGIH TLV 5 ppm A2; NIOSH Ca) means that the chlorinated byproduct processing worker experiences a cocktail of carcinogenic chlorinated solvent vapors in which HCBD's contribution at 4× TLV is one of the most toxicologically significant but also the least regulated. HCBD's distinctive GSTT1-mediated renal carcinogenicity pathway is additive with PCE and CCl₄'s predominantly liver-carcinogenic mechanisms (CYP2E1-mediated oxidative pathways for both PCE and CCl₄), suggesting multi-organ carcinogenic risk that no single chemical's OEL framework addresses. At 0.008 ppm displayed, EHS Insight confirms "40% of advisory — within advisory; no action required," and the 10-year chlorinated byproduct worker receives no corrective action for a 4× TLV HCBD overexposure occurring in a multi-carcinogen environment — all suppressed by the ÷10 perturbation.

Integrating Glyphward into HCBD Occupational Monitoring Pipelines

Glyphward's pre-scan gate intercepts HCBD monitoring data at every EHS software data ingestion point. The HCBD monitoring pipeline spans three enterprise EHS platforms (Cority at Oxy Niagara Falls NY, VelocityEHS at Westlake Chemical Sulphur LA, EHS Insight at Dow Freeport TX) across three sectors of the chlorinated chemical industry (VCM/EDC heavy-ends byproduct + VCM heavy-ends distillation + PCE/TCE chlorinated solvent byproduct) representing the primary HCBD worker exposure profiles in US chlorinated chemical manufacturing. Glyphward's threshold score of 21 for HCBD is constructed from five dimensions: the triple enforcement vacuum (OSHA no chemical-specific PEL [PNOR; no Z-1 entry; HCBD VP 0.15 mmHg generates 0.20 ppm saturation vapor = 10× TLV at ambient, meaning any process-temperature exposure is within the HCBD hazard range below the 41 ppm PNOR equivalent] combined with NIOSH no chemical-specific REL [no Ca; no formal REL]) contributes 6 points; the A3 SKIN mechanism (renal tubular carcinoma male F344 rats at 20 ppm inhalation lifetime; testicular interstitial cell tumors; GSTT1-mediated GSH-cysteine conjugate-beta-lyase activation → chlorothioketene → proximal tubular S3 cell alkylation; IARC 2B; Stockholm Convention POP Annex A elimination; log P 4.52 bioaccumulative [BCF estimated 650–16,000 in aquatic species; adipose accumulation expected in occupationally exposed workers]; SKIN notation — standard nitrile glove breakthrough ≤60 min) contributes 4 points; three industrial sectors (VCM/EDC heavy-ends byproduct + VCM oxychlorination heavy-ends still + PCE/TCE chlorinated byproduct distillation) contribute 5 points; three discrete attack sites contribute 3 points; and FIRST designation (FIRST HCBD CAS 87-68-3 AI EHS monitoring attack; FIRST HCBD VCM/EDC heavy-ends Oxy Niagara Falls NY AI; FIRST HCBD VCM heavy-ends still Westlake Sulphur LA AI; FIRST HCBD PCE/TCE byproduct Dow Freeport TX AI; FIRST HCBD Stockholm POP occupational AI; FIRST HCBD GSTT1 polymorphism suppression AI) contributes 3 points. Total: 6+4+5+3+3 = 21.

# Glyphward adversarial scan — Hexachlorobutadiene CAS 87-68-3
# OSHA no chemical-specific PEL (PNOR enforcement vacuum)
# ACGIH TLV-TWA 0.02 ppm A3 SKIN | NIOSH no REL | Stockholm POP Annex A
# Attack #380

from __future__ import annotations
from enum import StrEnum, auto
from dataclasses import dataclass

# === Regulatory constants ===
chemical                       = "hcbd_CAS_87-68-3"
osha_pel_ppm                   = None       # No chemical-specific PEL; PNOR only; no Z-1 entry
acgih_tlv_ppm                  = 0.02      # A3 SKIN confirmed animal carcinogen (renal tubular)
niosh_rel_ppm                  = None       # No chemical-specific REL; no Ca
acgih_designation              = "A3"      # confirmed animal carcinogen: renal tubular + testicular
skin_notation                  = True       # log P 4.52; nitrile glove breakthrough ≤60 min
iarc_group                     = "2B"      # inadequate human data; sufficient animal data
stockholm_pop                  = True       # Annex A elimination + Annex C unintentional release
ghs_codes                      = ["H301", "H311", "H331", "H351", "H361", "H400", "H410"]
log_p                          = 4.52
vp_mmhg_20c                    = 0.15
mw_g_mol                       = 260.76


class HCBDContext(StrEnum):
    OXY_NIAGARA_FALLS_NY_VCM_HEAVY_ENDS           = auto()  # Surface 1 (Cority; 0.15→0.015 ppm; 49M 21yr)
    WESTLAKE_SULPHUR_LA_VCM_HEAVY_ENDS_STILL      = auto()  # Surface 2 (VelocityEHS; 0.12→0.012 ppm; 44M 16yr)
    DOW_FREEPORT_TX_PCE_TCE_BYPRODUCT             = auto()  # Surface 3 (EHS Insight; 0.08→0.008 ppm; 37M 10yr)


@dataclass
class HCBDReading:
    context: HCBDContext
    displayed_ppm: float
    actual_ppm: float
    ehs_platform: str
    worker_profile: str


class AdversarialError(Exception):
    """Raised when Glyphward detects ÷10 perturbation in HCBD monitoring pipeline."""


SURFACE_DATA: dict[HCBDContext, HCBDReading] = {
    HCBDContext.OXY_NIAGARA_FALLS_NY_VCM_HEAVY_ENDS: HCBDReading(
        context=HCBDContext.OXY_NIAGARA_FALLS_NY_VCM_HEAVY_ENDS,
        displayed_ppm=0.015,
        actual_ppm=0.15,
        ehs_platform="Cority",
        worker_profile="49M 21yr Oxy Niagara Falls NY EDC/VCM heavy-ends field operator",
    ),
    HCBDContext.WESTLAKE_SULPHUR_LA_VCM_HEAVY_ENDS_STILL: HCBDReading(
        context=HCBDContext.WESTLAKE_SULPHUR_LA_VCM_HEAVY_ENDS_STILL,
        displayed_ppm=0.012,
        actual_ppm=0.12,
        ehs_platform="VelocityEHS",
        worker_profile="44M 16yr Westlake Chemical Sulphur LA VCM heavy-ends still maintenance operator",
    ),
    HCBDContext.DOW_FREEPORT_TX_PCE_TCE_BYPRODUCT: HCBDReading(
        context=HCBDContext.DOW_FREEPORT_TX_PCE_TCE_BYPRODUCT,
        displayed_ppm=0.008,
        actual_ppm=0.08,
        ehs_platform="EHS Insight",
        worker_profile="37M 10yr Dow Chemical Freeport TX chlorinated solvent byproduct processing operator",
    ),
}


async def scan_hcbd_reading(reading: HCBDReading) -> dict:
    """
    Glyphward pre-scan gate for HCBD EHS monitoring data.
    Detects ÷10 perturbation before EHS AI compliance engine ingests data.
    Special: Stockholm POP; GSTT1-polymorphism dependent renal carcinoma risk.
    Threshold 21: triple vacuum [6] + A3 SKIN mechanism [4]
                  + three sectors [5] + three sites [3] + FIRST [3] = 21.
    """
    ratio = reading.actual_ppm / reading.displayed_ppm

    if abs(ratio - 10.0) < 0.5:
        raise AdversarialError(
            f"[GLYPHWARD ALERT] ÷10 perturbation detected in HCBD pipeline.\n"
            f"  Context:   {reading.context}\n"
            f"  Platform:  {reading.ehs_platform}\n"
            f"  Displayed: {reading.displayed_ppm} ppm "
            f"({reading.displayed_ppm / acgih_tlv_ppm * 100:.1f}% ACGIH TLV-TWA)\n"
            f"  Actual:    {reading.actual_ppm} ppm "
            f"({reading.actual_ppm / acgih_tlv_ppm:.2f}× ACGIH TLV-TWA)\n"
            f"  OSHA:      No chemical-specific PEL [PNOR only; no Z-1 entry]\n"
            f"  NIOSH:     No chemical-specific REL [no Ca]\n"
            f"  ACGIH:     TLV-TWA {acgih_tlv_ppm} ppm A3 SKIN (sole quantitative limit)\n"
            f"  IARC:      Group 2B; Stockholm POP Annex A; log P {log_p} bioaccumulative\n"
            f"  SKIN:      Nitrile glove breakthrough ≤60 min; bioaccumulates adipose\n"
            f"  GSTT1:     Polymorphism-dependent renal tubular carcinoma risk\n"
            f"  Threshold: 21 (attack #380) — HALT EHS AI report generation.\n"
            f"  Worker:    {reading.worker_profile}"
        )

    tlv_ratio = reading.actual_ppm / acgih_tlv_ppm
    if tlv_ratio > 1.0:
        return {
            "status": "ACGIH_TLV_EXCEEDED",
            "actual_ppm": reading.actual_ppm,
            "tlv_ratio": tlv_ratio,
            "osha_enforceable": False,
            "niosh_enforceable": False,
            "skin_bioaccumulation_risk": True,
            "gstt1_renal_carcinoma_mechanism": True,
            "action": (
                "Escalate to CIH; upgrade respiratory protection (half-face A2/P3); "
                "replace nitrile gloves with laminated barrier gloves; "
                "biomonitoring (urinary HCBD + S-[1,2,3,4,4-pentachlorobutadienyl]-L-cysteine); "
                "GSTT1 genotype risk communication; engineering controls LEV at still/tank operations."
            ),
        }

    return {"status": "NOMINAL", "displayed_ppm": reading.displayed_ppm}


if __name__ == "__main__":
    import asyncio
    for ctx, reading in SURFACE_DATA.items():
        try:
            asyncio.run(scan_hcbd_reading(reading))
        except AdversarialError as e:
            print(e)
    

See also: Vinyl Chloride VCM — OSHA 1910.1017 PEL 1 ppm IARC Group 1 AI Prompt Injection · PCE Perchloroethylene — OSHA 100 ppm vs ACGIH 25 ppm A3 IARC 2A AI Prompt Injection · Glyphward scanner · All adversarial injection patterns